Sagebrushfire, it really makes sense when described that way. You also answered another question I always had...I have wondered why several photos taken on the same camera, with the exact same settings have always had different file sizes. It's all clear to me now. Thanks!
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Brian
Canon T2i/550D
Canon EF-S 18-55mm f/3.5-5.6 IS
Canon EF-S 55-250mm f/4-5.6 IS